Hi Guys
I have debian boxes throughout a wan that I would like to
setup so they pull updated packages etc off one central
box.
Any ideas ?

Depends ;-) For example on the number of packages
you frequently install/update etc. A somewhat complete
package mirror may cause more traffic than you save.
So maybe have a look at
apt-proxy - Debian archive proxy and partial mirror builder

After setting up point your machine's /etc/apt/sources to
this mirror/apt-proxy.